Main Page | See live article | Alphabetical index TSAN (The SysOps Association Network) was an underground network of bulletin board systems that shared an interest in phreaking, hacking, and cracking. The network was especially active in the late 1980s, when it linked the message and file boards of several hundred bulletin board systems via Fidonet. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.